Removable-blade screw driver



Oct. 9 1923.

N. A. JOHNSON REMOVABLE BLADE SCREW DRIVER Filed March 6, 1922 61H01 umgPatented Oct. 9, 1923.

v UNITED VT TES.

A NELs'n. JoHNsoim'or JAMESTOWN, NEW YORK.

VRiti/rorienta-BLA.nn SCREW DRIVER.

I Application filed March 6, 1922. seria; No. 541,373.,

similar tools and the obj ect of thevimprovel ment is to providemechanism Aby meansof which blades of different sizes may be readilyremoved and insertedv being Vsecurely held by aV resilient holdingmeans, which permits easy disconnection of the blade therev from andreattachment thereto, means being provided for the quick starting of theblade l should it become rusted'or otherwise set in the socket; and theinvention consists in the novel features and combinations hereinafterset forth and claimed.

In the drawings, Figure 1 is an elevation of theV screw driver with theblade turned edgewise. Fig. 2 is an elevation of the screw driver withthe blade turned flatwise and the blade attaching portion shown indiametral section at line 2-2 in Fig. l. Fig.

, 3 is a perspective view of the returnbend or U-shaped attaching springfor the screw driver blades. Fig. 4 is a diametral secf tional view atline 4 4 in Fig. 2 Of the blade attaching portion of the screw driver,

Vshowing the preferred arrangement of the same. Fig. 5 is a crosswisesectional view at line 5 5 in Fig. 4 showing the preferred constructionof the parts. l F ig. 6 is a perspective view of the butt of one of thescrew driver blades showing the open-ended attaching Or retaining slottherein. Fig. 7 is arperspective view ofthe blade attaching or retainingplug removed from the tubular holding piece or ferrule.

VLike characters of reference refer to corresponding parts in theseveral views.

The screw driver preferably comprises the handle 10 with its spaced-grooves extending around the handle in order to obtain a strong grip onsaid handle. The handle 10 is fitted into the ferrule 11v which has theretaining plug 12 therein for the removable screw driver blade or bit13. Y j? The retaining plug 12 has the-open-ended diametral slot 14 intowhich is fitted the return bend end Of the U-shaped spring 15 infirmholding engagement so that its slightly tapered free ends`16,-whichalsornormally may extendinto the^ spread `apart slightly, socket 17 forthe butt 18 of the screw driver blade 13 in the ferrule 11. The butt 18has the crosswise diametral open-ended Vslot 19 i therein with slightlyroundededges 20at i each side to receive and press together the Yspreading tapered free ends 16 v of the.v U- shaped spring l5 in a firmretaining engage- ,.ment. for saidbuttso that when the blade 13` ispressed upon'the lscrew head,` iti w'illbe also Vheld from turningv inthe socketmlr?. The plug 12 is preferably spot welded 'or riveted intheferrulell so that the return bend spring 15`is fixedly held in thegroove 14 in l,tlieplug 12,-V aIl'Cl .extends out slightly at eachendofsaid groove 14.

` The struck-up spring 15"has "the: sharp edges 22, and isof suiiicientwidth to cut; into the opposite sides of the inner wall Off the ferrule11, as shown at 23 in Figs. 4 and 5 when the plug 12 and spring 15 aredriven into place in the ferrule 11, thereby assisting in holding theplug 12 from turning, as well as holding the free ends 16 of the spring15 firmly in position to insert in theV slot 19 in the butt 18. A hole21 is provided through the ferrule 11 and plug 12 above the spring 15through which a rodor tool maybe inserted to assist in star-tingv aVhard set or rusted screw. y

The ferrule 11 has the holes 24 opposite the joint 25 between the butt18 of the screw driver' blade 13 so that a tool, as for example, a prickpunch, may be inserted in the hole 24 into the joint 25 and a quick tapof the hammer starts the screw driver blade 13 should it become set inthe socket 17.

In assembling the screw driver, the return bend end of the spring 15 isinserted in the open-ended slot 14, being driven firmly into placetherein with the ends 22 extending slightly at each side.v The plug12 is'then driven into the straight tubular portion'of the ferrule 11, theedges 22 scoring intorthe inner wall of the ferrule llas shown at Theplug 12 is shaped toa close iit within the ferrule 11 and atta1hed byspot welding or riveting in correct position so that the'hole i 21 intheplug 12 corresponds to the holes 21v at each side in the ferrule 11,and thelowerv end of the plug 12 centers the holes v24 at each" y side,thereby providing the socket 17 with.

lio p the free Vends 16 of the spring 15 extending loo into Said socketto be received into the openended slot 19 in the' butt 1S of the screwdriver' blade 13, said free ends being spread slightly as stated to gripfirmly against the Walls of said slot 19, thereby holding the blade 13rnily in position in the socket 17. The handle 10 is driven into theer'ru'le' 11 preferably a tight it, though it may beriveted or otherwiseattachedther'eon,

YThe construction provides a simple and c'eiiveq'ient spring retentionfor' the blades 13, of xvhieha series of different sizes may beprovided, which may be" quickly changed as desired. Y

llfllia't is cla'in'ied as 'new is:

1. A screw driver handlehaving a socket in one endV thereof'` a screivdriver blade littiiig in said socket, and resilient in eans rigidlvsecuredto said handle Withinsaid socket, aic partially enclosed by saidblade for reta;i"ig the' latter in 'said socket vand for transmittingdrive from said handle to said blade.

Q. s'crevv driver handle having ak socket filires, a sa; Ushaped springmedically eoswse or said' socket Said handle, and a screw driver bladeVhaving" a crossvv'ise openended slet in the butt thereof to beremovably retained by Ythe, free ends of said spring Within said socket.u Y l 3". lira screw7 driverA handle, a fer-rule having' a solid plugattached therein to form a socket inA oneend of said ferrule, a returnbent spring attachedin said plugvvithin said socketi'vith free'ends, anda screw driver blade having a crosswise slotted butt tting in saidsocket andy receivable in holding engagement on said spring` ends,Within said socket. f i l et. A screwdriver cozn-prising a handlehavingv a VJerrulethereon,- aL pltig attached in said ferrl'ile to' ferma socket in one end, a 'screw driver blade having acrosswise openendedslot in the butt there'oi` and littirlg` in said soclet,a taperendedreturn bend spring having its ends spaced apart and va'ttaclied in saidcrossivise groove in said plug, said spaced ends free to be resilentl'yfreceived in said cro's'sWi'se groeveinY the butt or said screvv' driverin helding e'nf., "agefrnent.'k Y

In testimony whereof I have affixed Vvmy signature inthe presence ci twoWitnesses'. NELS JHNSON. Vl/Titnesses i Cosmi@ V. SWN'SN', A. W.

